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APA Citation
Sharp, J. T., Wolfe, F., Corbett, M., Isomaki, H., Mitchell, D. M., Furst, D. E., Sibley, J., & Shipley, M. (1993). radiological progression in rheumatoid arthritis: how many patients are required in a treatment trial to test disease modification?. Annals of the rheumatic diseases, 52(5), 332–337. http://access.bl.uk/ark:/81055/vdc_100135156853.0x000059